Once it s shaped it is fired between 2 100 to 2 300 fahrenheit.
Ceramic insulators value.
Link to other types of insulators.
Insulators were originally designed to keep the wires linking telegraphs and telephones insulated from the wooden poles that held them aloft.
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In the 1950s electrical companies transitioned to porcelain insulators.
Ceramic is made of red brown or white porous clay.
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In conjunction with the expansion of rural electrification in the early 20th century there was a major boom in the manufacturing of insulators with production peaking from the 1920s through the 1940s when millions of hemingray dominion and.
Most of the insulators available today come from this era.
Glass insulators were first produced in the 1850 s for use with telegraph lines.
Return to the national insulator association page.
In north america glass was always the predominate material for communications insulators but porcelain has become the standard for power distribution due to its greater strength and surface resistance.
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Collecting insulators is a fun and unique hobby that will allow you to learn much about the history and make of these unique objects.
Ceramic is less expensive to produce than porcelain.
Click on an insulator above for more information.
Today there are over 2000 collectors and insulator clubs national shows and good reference books are available.
As technology developed insulators were needed for telephone lines electric power lines and other applications.
In the mid 1960 s a few people began collecting these glass and porcelain insulators.
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From 1920 to 1950 there was a peak in the manufacture of glass insulators.
The 126 page value guide lists manufacturer marking catalog number color rarity and value for 4354 different unipart pin type styles and 1201 different multipart pin type styles.
Similar to their glass counterparts porcelain insulators date back to before the civil war for telegraph wires.
This increased the need for the glass insulator and more companies sprang up in response to the need.
This transition was complete by the 1970s.